This guide is designed to teach you how to write a letter of instruction for heirs, or anyone else who may benefit from a little more direction. A letter of instruction is a cheat sheet for anyone involved in settling your affairs.Unlike a will, this letter has no legal authority. What is in a Letter of Instruction? A personal letter of instruction to loved ones, children, trustees, agents and others is a critical step in your estate plan. Member Service Center (707) 449-4000 or (800) 877-8328 Monday – Friday: 8 am – 7 pm (PDT) Saturday: 9 am – 5 pm List specific account numbers and what banking institutions or insurance companies you use. INTER District Attendance Application. About the sacrifices of our forefathers in blood, treasures, and in the case of the Alamo, their lives. Texas Senator Bob Hall.